The functions and advantages of the DVE liquid ring vacuum pump The DVE series liquid ring vacuum pump is mainly composed of a circular pump body, eccentrically installed impellers, discs, and end covers, etc. Through the rotation of the impellers, a liquid ring is formed in the elliptical pump body (at this time, the working fluid simultaneously serves as the sealing medium, compression medium, and cooling medium. There is no wear and no need for lubrication).